At present, the calculation method based on statics does not consider the impact of the conductor on the crossing structure under the condition of disconnection or running. Therefore, the research on the element type of the suspension crossing frame and the conductor in numerical calculation and the behaviours of conductor breaking and running were carried out. Through the free swing test of the conductor, it was found that the conductor had certain flexibility under a certain length. Truss element should be selected to discretize the fiber rope of the conductor and crossing frame and this method could simulate the physical characteristics of the conductor and fiber rope objectively and truly. In the case of running line, the horizontal velocity of the conductor had almost no change along the axial direction of the conductor, while the vertical velocity presented a fluctuating distribution along the axial direction. In the case of the broken conductor, the horizontal and vertical velocity of the conductor were fluctuating along the axial direction of the conductor. The height of the conductor not only affected the horizontal velocity of the conductor, but also affected the vertical velocity of the conductor. It had important reference significance for the numerical calculation of nonlinear dynamics of the suspension crossing frame.